[ic] Completely unroll polymorphic IC map checks

src/ic/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ic/ic.h"
 
 #include <iostream>
 
 #include "src/accessors.h"
 #include "src/api-arguments-inl.h"
@@ skipping 753 matching lines @@
       handler_to_overwrite = i;
     } else if (handler_to_overwrite == -1 &&
                IsTransitionOfMonomorphicTarget(*current_map, *map)) {
       handler_to_overwrite = i;
     }
   }
 
   int number_of_valid_maps =
       number_of_maps - deprecated_maps - (handler_to_overwrite != -1);
 
-  if (number_of_valid_maps >= 4) return false;
+  if (number_of_valid_maps >= kMaxPolymorphicMapCount) return false;
   if (number_of_maps == 0 && state() != MONOMORPHIC && state() != POLYMORPHIC) {
     return false;
   }
   DCHECK(UseVector());
   if (!nexus()->FindHandlers(&handlers, maps.length())) return false;
 
   number_of_valid_maps++;
   if (number_of_valid_maps > 1 && is_keyed()) return false;
   if (number_of_valid_maps == 1) {
     ConfigureVectorState(name, receiver_map(), handler);
@@ skipping 2428 matching lines @@
     DCHECK_EQ(LookupIterator::INTERCEPTOR, it.state());
     it.Next();
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
                                        Object::GetProperty(&it));
   }
 
   return *result;
 }
 }  // namespace internal
 }  // namespace v8